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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ad169fbdea5d9e9e8255b32277d840a86377968ed5149cbe65bbea47b8c8aa' 
  AND token = 'y4iHdY052+8hwavG77/kUBLjGV5u6Syzi7aU1TDHHBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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