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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a2e75d14a2fb2fee8a695d82db3ccd6516bfe00312e99e12dde1b2fb5f82ac' 
  AND token = 'GYtVZrB/g+eGgvdZetep1bi5djWkevoYQMFII5j2G8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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