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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85264d330f0fbc74df434c5bf4f3fec28a68664a2ac0c442c3ebb53a641e32bd' 
  AND token = 'HFKt8LpfXSMh3fgsRJg9cW/MDEol4S1b6iz/E0VEMc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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