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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c41da20333449b9a9bdbd8051d7b0c6c9983e37115811e51c4bcd871d9bbe6' 
  AND token = 'X+c9HvIT96FXeBBPfU4/r6c2XQ/Po4Wcpaif98aIUa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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