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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe747a37c2da4d83b06dabb55a51338b937e632122968d81e93bb9e606871020' 
  AND token = 'fAAbdGXAMfl/0v59rJiiB0Q+4w81N5GTe2/xh6Bz0Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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