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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a253f34f7d614596dd849b6a99ee29dc7a368b4a6fafc719a1e403471463db83' 
  AND token = '2WYr4Q8JMXV7v5Dz8OOmyJgZnMJV0hl7YR4E6P3Rd7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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