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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3a41a1595a736786c22f18b51095d14d6126e46cbd4862f64fb1b221924faa' 
  AND token = 'MP4eqsGskN942mmolq7RH4W9ZmNS8lUCCbov7r1kuSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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