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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a0a8e99b00df80bb2ff08028da83008fad88365edf28052492c7b17770a0ff' 
  AND token = 'EUT+uDdDaCZQeIIRGZl3LKHAqrVC3Q/Bt+xbJS6kF7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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