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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f7048432fcfd902f073e4c07c95de7104e1b326e6f5d02775c645148e0d0e3' 
  AND token = 'ZDWrfZxGRfBW+IMsIImOh/KTy8XP5Us/P05jzMIBfmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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