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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787a7d2324f87fe30216a54125a039b69ba8c29aa0ba20496427d3ac437627a6' 
  AND token = '3+UwgaknJW+1PuksC2Fdx9Jdd9FeE10w0X+j3C9zQOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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