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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed555bcac95491e5a3c070cfae32151aed983603602147b7ebe74ccb2aae2116' 
  AND token = '4fgB9JKO7rbuaq+lrf3Oot82Y3a531YwmhfYK9/vzXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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