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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec4010139d81c9851da4e739bdef7f4ad1bc6df1637941937f01e2a5cc87651' 
  AND token = 'Vp7XpxsC/aeQT63t74m59ro6egx79gcLXnibT+yIWUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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