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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db02a8f908156fd53308173fede2120365e53f390ce62f0b2ba6fbe761f90efb' 
  AND token = 'zkl+i7t/zJc/erQseGpkhj7sa79pdBUL8NlrZmbh30k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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