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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fb3733a925b0c5573faf8afc0ea4f5f77f33de2ef7ce4261f1f5a8d24c1bb0' 
  AND token = 'R3nfjHU9erBcnVQFIAo6yT4ceTyxPp+zdEL2xqwiY30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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