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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6177fe836bde9c9fd02c2354cb67119f92936084154ce2a32f5eb919e98977f1' 
  AND token = 'hqxwKF+Qbw7FDG94AfESL/Ts+Wwmxufykgm/qsWF2NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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