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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12002fcf6a6a45109eac29d2c6477b22c97574fdc65286199927ad3f7e0f7eb5' 
  AND token = '4RVYw2mdtbDr9fza1qev7dsgEcNsAG770cKymZpYmxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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