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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa151c1df7da7c6d453f9c4cbdcd1218d94c37c9582a7b2002ae279f8a5df547' 
  AND token = 'DEzy9qcUSbIzEC0gUQNAiEQCtcOBvpI9WLesEJL9YDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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