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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076b5c8b340f3b2eade5fcad37d24263aa2f324ce6d9814c8f3149c9ac590b92' 
  AND token = 'N25uhWOaiNt7X7kU3ScdIJ7I9qfOyoo91kATIshZ87o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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