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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f759c0c2234330f94c0e2431668803b6c5f8438f2092784549735d6784f764' 
  AND token = 'n5vg2g8EvtNS5ca+KfkSUUHu7FIDNiS8tkrbCw8sM/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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