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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46fa8d44b347c1749a6dc7ea09f1dccae2c3a67e6081bc9667a2e935178cca0d' 
  AND token = 'nBVKRHCnTDbrmvfa2vxkzCQJMKtkPzCZofrmbAnJ6V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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