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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959b9b23b938a9ac0a7974e98ba3339767e3694b172d09ef16ed897973dc2f3e' 
  AND token = 'UIl0hO6oq4PU5LyQ7Ar5FjQC+r3DYYjgeVVreWrhTGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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