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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cd5d788279c48cd2aa28e0a29309d6fb7fc2d69b60ba4c0a6a0cdc33fb2a70' 
  AND token = 'hvsEHt478bDO0BPGfvvvXsvlYJ3bfwfYYAL3D2n8SDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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