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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b630de8e32f06a6a3c4f73f333efff92ae5626f0ba4d51e1c9f1ea0989b4bc2' 
  AND token = 'FgcnilDTeNEdWignA6U7TAaXV6twtchdkR237xow//M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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