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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e2a63fc8aba498928808daec0be60c867a3aabd3dfba0685aeccea18640744' 
  AND token = 'r/4JjUE13BTd/uL5sZ/Lu5pYg9InFw+4FInLPTg8UhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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