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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba78d95d79750e50c251bb3c36489a74ec58e7934ea235f3596e1438327035e' 
  AND token = '+9Wmm5CI5lYR0XY/4OuxeDQwPJaxd6LUHJ1dx0fQHqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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