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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb1cdff9801bc4d37bbabb2163abc89c1640bbc2b3464344922c7e046b3e8bd' 
  AND token = 'KAsnKVbNi/9WKTNEnBScP6+K061rh/SKYg+3oq6Qi9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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