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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea81a0537096ab24225ce9d4fc9b95abc69be315943ae91323b98ff86b9d1a8c' 
  AND token = 'Bz5JYVW3dKNjGKFrAsi/yDARlclc6hed/ePek/ZeyM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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