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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d069579879c5d3e6312c3a3f6bc634bf1db97cf656432b6a78799381e6a4c9' 
  AND token = 'nPqQX/oqA0f0vTXEKiHQUV0ETfedl9AkM3BYgHixRGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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