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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70051ef45eaba048c3176b13d7cbcc16b0c1f1e3d3f10c12a7e9feedba8b1e02' 
  AND token = '8j0URHuZpfVjZyhIcZGMFga1OVN/PtCjPtDGxfEmoXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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