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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941452797c8406cac13897114f869360b1cc4a68b0c9e9cdf26d041761f8003c' 
  AND token = 'Ih3kHIOr+nXST+4d7w0YIOxSk4Ey6KizlE+zutyw/VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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