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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f3b843cc2fbd229563fb18c4be27d77add2145da4cc85535fe43ff92adef21' 
  AND token = 'C2e+aGwFSpeagbiTAK2TCrIPDulRalOo1Un/amwhq5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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