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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ed6a2be99052d7ec08d6f3f0f2774a08d278b4fe4795082cdd6627cd138788' 
  AND token = 'pETI8w0tAL+jhSCKyz3JF0xpCg44J0u0bhKmny2LtMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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