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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00843d9c95ed1375c760d4c61aa982baecd296e2c3e316400b7a73adc689b876' 
  AND token = 'gA4O31MJx2ntOqqYdz1zfYszTDF+hLBJcv8x1CJM93A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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