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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e81151f98282f8f575dea3788a1cbebb9bab993a861624c4c36efc8080f4d9' 
  AND token = 'ShVUCH4jVadHc74OlyDoydLmFUtJMWzlQS4t26Q7s84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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