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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375d4a8cb27591d3adaee8ee121bb3330e169c87b38d14a349e643193172fed9' 
  AND token = '75A64vvhSHEVrpQ3cd157mc7tUKnnB3D5gUjObB4BwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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