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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad2fb640895fe5db3a40b585c841bd078feaf11fc5ca3fd0675bfcd58f5a8fd' 
  AND token = 'HNTpcz57kRMLCdc7yrBU3v76Xf0l/M4oGdEqERx1NJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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