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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282d8190c848b0d683af201c25ef689720a0fb6e58f805c231783826774edfc9' 
  AND token = 'ouAfB84EDiEBEN20rpu0VskgfcVTpRs9VEe7f9BDZlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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