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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca7ed171f171b6b89baaabd8d2f730f33f109adac26815fc04579e615159150' 
  AND token = 'l2c/dCgAip7Z9um20Xv6JW2+g5QGoWhbL9WO1wsHlag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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