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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c743054f13f21dc0cc54d6e7895a6a3a41ecd516f92e4c04336ab004040becd7' 
  AND token = 'nvZNH1RAT2Dj0ebvdOL1TzwK686WZaj04fBOTxy67d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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