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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a8771529d2af20b33492894a850bd4a497b00f443056e6df3ada167ce1a651' 
  AND token = 'Pas+WwtU5mHRU+cL1qY0Wi3QvuW1n31FgJA4IYMQ1ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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