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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216084f8672ef634704325f2a06d4c00cf0a7ce78d70445b634011f071fe1b04' 
  AND token = 'nnP6dPz0Ohp+lU0c5BWbYFPsFwvcgydzryrPflIca3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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