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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0841cba0445348582334fd423e8c80dd322bcf81f2c2033d4bc46b3e0df35c6' 
  AND token = 'o0lX7gjclcSfjm17ffV4RrLJ86agzzFf6TEytNtE0V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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