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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0ffebcd5650051363060b1df643a2f92c20119358e32a90e65e31151b07f7a' 
  AND token = '72lqCL5r0pTgu+0F9iD2KOCKU/5p6FYrB3OPLDanZqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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