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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7936dcc6c6e7a7d2c0471f878a7ff942552fb55fd3f4870d538ad7efa6bd3236' 
  AND token = 'pQ20Ply+PbRfB3sLEuC2EABrt2cNZ6nCucfxm4CJkMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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