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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285793fade8f3156363bf1c303d15e9e0fe7c63dca313054a653b8f2928f65fe' 
  AND token = 'nw/yrKC2+31fsSm0UTXIDnkB0pHkA301lk0jZ9nCr3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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