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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ad310d628059f11d547e1a1e88bbd0d7aa800bac09b6cade88ca6815461ed9' 
  AND token = 'Te35/kIkTJy/PePeBRLDF7/4x1MPKS4TKEltvRPt2cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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