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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf0ae593ae971e2bac757d770fc0d2b161c5eff92474699745173468e85bc5b' 
  AND token = 'sqJI27SqV2fAsQg+GIR1mFaW5C7v5bTAFGp1+O5Wb4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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