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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b226ab0683f18928405bbae9e8c8c62218764e6e6c18a23ed83a2a0b3ce27a' 
  AND token = 'kp19HdcBH6wzc/nhQ70KqRgTNrwtKNRtt8UFxSImkvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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