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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4702cc4c2912cd7947f1d1190d24d422b44351fc0be4ab97a3536d3be1e213a' 
  AND token = '65Jvlu0cvIeH3jKbvtqdUig4qNyiw3nt/n+9g4ySfQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}