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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf2223db6fd74a7f90f4fab2de27afd10ea74bedf7244c36bafb3a64bc1e7d6' 
  AND token = 'LHI5Udr5IT2vNI9mSKSp2IyxrHL0eEB3p33l4dNuUTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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