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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18acc05689359b15638952ed62f4d6a2afd487d49af376c8814c211002f68e83' 
  AND token = 'ni+TKv9o/sa3OVBf1r20Jumno4kAj07Cx6HTn1eldIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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