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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75fcb9ff5d3f2db08bb93d039f7d071e24119175588ddd86d1172cad09f7b9c' 
  AND token = 'FIKsVYonWStSxOUpykmZUwf98mK3EeVad3+N/UO1JDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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