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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a4305fe15ff0e9f77103a739ba3876aab941428f8398d87afd3e0028cfde31' 
  AND token = 'aPHp06DQATQzrILWlAJOm5ohiqApL2XvLOOgZqvpKFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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