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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcc9edf34e8243089a53ef2fa587f5e18e3ee1c0e7795edbeaa734ec79b9526' 
  AND token = 'r1mHLEEMv3zpdr419zRUmlUApM3clXvHljBivsjtbaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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