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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e4aca0b7dce03fc917907b465e354e025d6e93bfdc228bed18a3bf53226c87' 
  AND token = 'hwa4rZeSxLfg6Q1Yns7zxhkyNCNcgxN5RRLvz8peJbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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