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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693f2c456066722321af98dbc8431dca2d7f832aaa3e90e85ef8f9a2661a9fbe' 
  AND token = 'lZeI+hi4lvEqpWnw6sRd8y6jk783fn5jjugMBstyjxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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