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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936c35fa4629a76e0481535e2606fc83d1ac59718cb0aceb2c1ae9f27ba78f91' 
  AND token = '+271p86Nl1A6eGe3A2RNnEBaiqL7kDYCrzHHxBnT/kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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