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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3c82a6f48e4d79cc32f64956876f4e5029cb3dd5abd58087ad7be13e6fc6da' 
  AND token = 'qMBt/M6CuHXr0a3DeOZ7Nby/ORctL5k7lEIowfSOu38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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