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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f90d91217b12caf9b42db22f8a6a84cc182cedcda1bd4ba794dc080d1185b1a' 
  AND token = '4vyLWx+P0Z0sKfT550B+3f94FhS3Ouv4OVFq8GWr22w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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