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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1c9f80c06d6d352d29be35016c84b0dc13c05c88a54846383bf4c77a6987a5' 
  AND token = 'niRUJn7NxATQeGh/uxM7G2XE/jYwUKkwHTRvsJxk1nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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